Key to Campsicnemus males from Atlantic Ocean islands

1. Femora and tibiae practically simple; fore and mid basitarsi bearing very long bristly hairs, and 2nd-5th segments of same tarsi with elongated hairs; 2nd segment of mid tarsus flattened ventrally; 2.0 mm (Canary Is.) ……………………………………………………… C. crinitarsis Strobl, 1906

– Femora or tibiae modified or bearing bunches or rows of remarkable setae; tarsi differently setose, often modified…………………………………………….…………………………………………2

2. Fore tibia strongly dilated; tarsal segments 1, 2 and 4 shortened, and 1st-3rd segments of fore tarsus bearing very long processes covered with long hairs; face golden-yellow; 3.0 mm (St. Helena)………………………………………………….………….… C. magius (Loew, 1845)

– Fore leg practically simple; face usually yellowish-grey………………………………………….3

3. Mid basitarsus much shorter than next segment; hind femur with ventral row of strong black bristles; face yellow brown; 2.0- 2.75 mm (Azores, Canary Is. and Madeira)…… C. curvipes (Fallén, 1823)

– Mid basitarsus about as long as or longer than next segment; hind femur with at most fine pale setae; face yellowish-grey…………………………………………………………………………………..4

4. Mid tibia considerably dilated along entire length and curved; mid basitarsus with thick apical tooth; 1.5 mm (St. Helena)……………………………………………………… C. sanctaehelenae sp. nov.

– Mid tibia not dilated or slightly thickened; mid basitarsus with at most thin apical spine……………………………………...………………………………………………………5

5. Mid femur without ventral subapical excavation; mid tibia with erect ventral spinules and cilia along entire length; mid basitarsus 1.5 times longer than next segment; 3.7 mm (St. Helena).…….… ……………………………………...………………………………………… C. flavissimus sp. nov.

– Mid femur with deep ventral subapical excavation; mid tibia without erect ventral spinules and cilia; mid basitarsus not longer than next segment….….……………………………….6

6. Mid tibia and basitarsus densely covered with long setae along entire length; antennal postpedicel 3 times longer than high at base, with drawn-out apex; 1.85 mm (St. Helena) ……………….…….. …….…….…….…….…….…….…….…….…….…….…….…….…….… C. meridionalis sp. nov.

– Mid tibia with long setae in basal half only in addition to 3 strong anterodorsal bristles in distal part; mid basitarsus with short setulae; antennal postpedicel triangular, slightly longer than high at base; 2.2-2.5 mm (Azores)…………………………………………………… C. atlanticus Dyte, 1980